<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <script src="js/marked.min.js"></script>
    <!--<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>-->
    <title></title>
    <style>
        body {

            background-color: #f8f9fa;
            font-family: Arial, sans-serif;
        }

        .container {

            margin: 50px auto;
            width: 800px;
            background-color: #fff;
            padding: 20px;
            border-radius: 5px;
            box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
        }

        h1 {

            text-align: center;
            margin-bottom: 30px;
        }

        label {

            display: block;
            margin-bottom: 10px;
            color: #333;
        }

        input[type="text"] {

            width: 85%;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 3px;
        }

        input[type="submit"] {

            background-color: #2ecc71;
            color: #fff;
            border: none;
            padding: 10px 20px;
            border-radius: 3px;
            cursor: pointer;
            width: 10%;
        }

        .chat-box {

            width: 100%;
            height: 500px;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 3px;
            overflow-y: scroll;
        }

        .message {

            margin-bottom: 10px;
            padding: 10px;
            background-color: #f1f1f1;
            border-radius: 3px;
        }

        .user-message {

            background-color: #2ecc71;
            color: #fff;
        }

        .bot-message {

            background-color: #e6aa6b;
            color: #fff;
        }

        .loader {

            text-align: center;
        }

        .loader::after {

            content: "";
            display: inline-block;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            border: 2px solid #ccc;
            border-top-color: #2ecc71;
            animation: spin 1s infinite linear;
        }

        @keyframes spin {

            to {

                transform: rotate(360deg);
            }
        }
    </style>
</head>
<body>
<div class="container">
    <h1>AI 对话</h1>
    <form id="form" style="width: 47%;position: absolute;bottom: 150px;margin-left:15px">
        <input type="text" id="message" name="message" placeholder="输入你的问题">
        <input type="submit" value="发送">
    </form>
    <br>
    <div id="loader" class="loader" style="display: none;"></div>
    <div id="chat-box" class="chat-box"></div>
</div>

<script>
    var loader = document.getElementById("loader");

    document.getElementById("form").addEventListener("submit", function(event) {

        event.preventDefault();

        var messageInput = document.getElementById("message");
        var message = messageInput.value;
        messageInput.value = "";

        var chatBox = document.getElementById("chat-box");

        var userMessage = document.createElement("div");
        userMessage.className = "message";
        userMessage.textContent = "我: " + message;
        chatBox.appendChild(userMessage);
        chatBox.scrollTop = chatBox.scrollHeight;

        loader.style.display = "block";

        var xhr = new XMLHttpRequest();
        xhr.open("GET", "http://localhost:8080/ai/chat?message=" + encodeURIComponent(message), true);
        xhr.onreadystatechange = function() {

            if (xhr.readyState === 4) {

                loader.style.display = "none";

                if (xhr.status === 200) {

                    var response = xhr.responseText;

                    var botMessage = document.createElement("div");
                    botMessage.className = "message bot-message";

                    var botMessageText = document.createElement("span");
                    botMessageText.className = "message-text";
                    botMessage.appendChild(botMessageText);
                    botMessageText.innerHTML = marked.marked(response);

                    chatBox.appendChild(botMessage);
                    chatBox.scrollTop = chatBox.scrollHeight;
                } else if (xhr.status === 400) {

                    var error = JSON.parse(xhr.responseText);

                    var errorMessage = document.createElement("div");
                    errorMessage.className = "message bot-message";
                    errorMessage.textContent = "Bot: " + error.message;
                    chatBox.appendChild(errorMessage);
                    chatBox.scrollTop = chatBox.scrollHeight;
                } else {

                    var errorMessage = document.createElement("div");
                    errorMessage.className = "message bot-message";
                    errorMessage.textContent = "Bot: Failed to connect to the backend service. Please make sure the backend service is running.";
                    chatBox.appendChild(errorMessage);
                    chatBox.scrollTop = chatBox.scrollHeight;
                }
            }
        };

        xhr.onloadstart = function() {

            loader.style.display = "block";
        };

        xhr.onloadend = function() {

            loader.style.display = "none";
        };

        xhr.send();
    });
</script>
</body>
</html>
